Oval Racing - BOMBARDIER 1996 Ski-doo MX Z440 Handbook

OVAL RACING

Special Rules
Rear of tunnel must be enclosed per specifications in the I.S.R rulebook.
Tail light AND brake light element must be on at all times! Add a jumper wire inside the taillight
assembly.
Any glass lenses must be taped over with clear tape.
Front suspension
Lower the ride height to the two inch minimum travel requirement. Shorter springs are available.
486066300
486066400
Use the 3/4 inch diameter sway bar kit (580 6045 00).
Camber : Left=O degrees
Verify ski toe out at the carbide edge.
Spot weld the upper deck to the lower portion of the steel skis. One inch every one inch is
sufficient.
a piece of angle welded lengthwise on the underside.
Another trick is to fill the swing arms with spray foam insulation. When the foam hardens it
helps the swing arms resist bending without adding much weight.
Steering ball joints should have as many jam nuts added as will fit between the tie rod and the
ball joint. This helps prevent bending of the threaded portion of the ball joint.
Center
Use spring P / N 4860665 00(70 lbs/inch, 6 inch free length) and soft preload.
Use a shorter nylon limiter strap (486 0562 00).
Additional holes will need to be drilled in the MX-Z rubber straps.
Rear suspension
Lower the ride height to the two inch minimum travel requirement.
Install a 4th idler wheel on the rear axle.
Stiffer springs and firm preload maybe required to reduce weight transfer and help keep the skis
on the ice. If the handling is generally good but the inside ski is lifting, increase the right rear
spring preload.
Install a slide lubrication system with nozzles on the outside of the right hand slider shoes.
Section COMPETITION
07
125 lbs/in 8 inch free length
150 lbs/in
8 inch free length
Right= Negative 2 to 4 degrees
PREPARATION
07-7